Is there fog on the mountain from 7 am to 9 am?

This depends on the specific situation.

Autumn and winter are usually at night and in the morning, and it is easy to fog in windless weather with large temperature difference.

Because of the large temperature difference, fog is easy to form in mountainous areas, especially in some mountainous areas with good vegetation coverage.

After the rain, because the air is humid, it is prone to foggy weather.

In short, these are not absolute. If you are traveling, the more famous scenic spots generally have weather forecasts, so you can check them online.

It is not impossible, such as the famous Huangshan Mountain.

Although it is foggy all year round, it is not so easy to see a sunrise.

Fog is not necessarily a bad thing, but it's good to see the sea of clouds.